From the website:
This large printable map is a beautiful surface for building the seedy side of a medieval town, Victorian neighborhood or steampunk metropolis. It's easy to print in one piece at your local shop, or in sections on your desktop printer. An optional 1-inch grid is included, and this map is tileable in the sense that you can choose any section and it will "wrap" around to the opposite side. That means you can start with any section you like and expand it from there, and with a little bit of planning it's possible get several unique 36"x36" maps from this one kit.